[OSM-dev] Data format for OSM annotation layers

SteveC steve at asklater.com
Sat Nov 25 16:06:58 GMT 2006


* @ 25/11/06 04:04:49 PM Nick.Whitelegg at solent.ac.uk wrote:
> >> >GeoRSS would be perfect for this, wouldn't it? Then you could allow
> >> >people to subscribe to updates in their area, and it'd be very
> >> >portable and could be used on many different systems. I'd say KML
> >> >would be a good addition to a GeoRSS feed, especially as Google
> >> >Earth/Maps seem to be resisting GeoRSS so far.
> >>
> >> My understanding of GeoRSS is that it is basically a geo-coded RSS 
> format,
> >> i.e. it's good for (as you say) alerting people of updates on a map.
> >> However it doesn't really seem to be designed for bounding-box 
> retrieval.
> >> The sort of app I had in mind involves the user panning an OSM slippy 
> map
> >> and markers appearing as you move into new areas. Such an app would
> >> require a server which takes a bounding box and returns data of some 
> sort
> >> representing the markers within.
> 
> >Although this is true, WFS Simple is doing exactly this: taking the WFS
> >format, and changing the output to be encoded in GeoRSS. Starting off
> >from a script that just includes a bounding box should work ifne, and in
> >fact, many of the existing GeoRSS server support some kind of location
> >based query.
> 
> >Using GeoRSS and adding in a bbox param seems to make perfect sense to
> >me.
> 
> OK - looks like GeoRSS it is then.
> Doesn't look like it'll be too hard to implement a tiled, bbox-based 
> GeoRSS layer in OpenLayers... basically a case of taking bits from the 
> existing (tiled) WFS layer code with the existing (untiled) GeoRSS layer 
> code.

Attach an event that fires Whenever the map stops moving which grabs a
feed with that bbox, a-la pubmap.co.uk

> 
> Nick
> 
> 

have fun,

SteveC steve at asklater.com http://www.asklater.com/steve/




More information about the dev mailing list